K&N air filter, can they cause problems, now with piccie

[Taz69]

Hi guys,

I have a GSXR 750M 91, only recently purchased it, when doing a service on it, I found it had a K&N Air filter, however what is worrying me is I read on sportsbike.com that another guy had a problem with his bike/filter, its just that my bro reckons my bike appears to be choking, spluttering etc, it has a thru can on aswell, do I need to have it tuned to keep the K&N or should I just go and get a standard one and see what happens, I am pretty sure the previous owner didnt have the k&n fitted or tuned etc.

Any help welcome

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[Keen]

don't know much, but I think the carbs might need to be rejetted....
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"he who makes a beast of himself gets rid of the pain of being a man"- Dr. Johnson

[Trixie]

Not sure, but you may be running lean. Get this sorted; you do not want to be holing a piston.

I think Keen is right. Check your jetting. I bet it's probably standard, which isn't enough for a free breathing exhaust and air filter.
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Dead nobodies in company cars...

[Taz69]

Hi chaps, if I replace the filter with a standard one will that make it better even if I keep the exhaust ?

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[Trixie]

It's really difficult to say without seeing or hearing the bike.
It will probably help. If it doesn't cure it, you're then probably in the realms of jetting or replacing the exhaust.

Can you take a look at your spark plugs? That will give an indication as to how your engine is running. Take them out and take a look and note. Then clean 'em up and run the bike with the different air filter. Have a look at the plugs then. If you can post before and after pictures that will help.
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Dead nobodies in company cars...

[Taz69]

Hi m8, I have just replaced the spark plugs, oil etc, the plugs were a bit black if I recall, will take a picture so you can see.

I have the original can, but its down Plymouth and I am in Bristol, I will be picking it up later this month.

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[Kickstart]

Hi

Either the can or the K&N are likely to need some playing with the jetting. Only real way to tell is to stick it on a dyno with an exhaust gas analyser and see what it is doing at various revs.

Chances are that both would lean it would slightly (but by different amounts at different revs).

If the bike feels like it is running rich then it is possible that someone has already tried rejetting and made a mess of it (eg, thought that a Dynojet stage 3 kit was better than a stage 1 kit, not realising that neither are better just that they are designed for different levels of engine tuning).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Taz69]

Also another thing I have noticed on the K&N is at the base of the filter there is a plastic ring just before it goes to the inner part where it is the sealing ring, this plastic appears to have melted at some stage but only in a small area, is this a indication of anything ?

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[Kickstart]

Hi

Not really, but is this a K&N replacement filter (ie, goes in the standard airbox) or a set of 4 pod filters, one per carb? Just the pic you posted looks like a pod filter and I though the GSXR would have had a flat panel filter.

Air leaks before the carbs (after the filter) will have some effect on mixture (but more importantly will allow in dirty air. Air leaks after the carbs are very bad news.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Taz69]

Hi m8, its a replacement filter, not the four pods, I took that piccie from kns site, it was all sealed, any ideas why it would melt on 1 side,

Will take some piccies later and post em

Just wondering if I should go and get a standard filter now .

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[bish777]

taz, give me a ring and ill come help you sort the bike out-i still have the most of a dynojet kit for a GSXR, and am a bit if a jetting guru.

Plus im 5 minutes up the road......
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GSXR1100J

[Taz69]

Bish, your a star m8, will give you a call tomorrow sometime bud, sort a time out,

I have took piccies of the plugs and filter, waiting for them to come over from my nephew by email, according to the Haynes manual my plugs look like fuel/air mixture, faulty choke or blocked air filter.

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[sickpup]

Dynojet kits do not work on the 750m's powerjet carbs very well infact they stop the powerjet working.

The k+n is a pod filter on an adapter plate for the 750M. It comes with 2 rings if I remember and you need the ring with the smaller hole to get it to work. Trust me the bigger ring won't run right.

[Taz69]

Hi m8, not sure about the rings as it was fitted before I bought the bike, didnt even know there was a K&N in there until I started stipping the bike for a service, any ideas how I can tell ?

Here are some piccies of the plugs and filter.

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[bish777]

[sickpup]

[Taz69]

Hi SP, the carbs do have the tubes on them, they are standard jets and needles at the mo, Bish and I cleaned them out, floats adjusted to the right level, pilot screws adjusted as per the manual, will hopefully get it back together tomorrow to run it.

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[sickpup]

So fit a factory pro kit, if you're running a race pipe as well as the K+N you run the risk of seizing the lump.

The factory pro kit is cheaper and better than the Dynojet kit, the emulsion tubes and needles don't wear out so quick.

[Taz69]

Hi m8, any ideas where I can find a factory pro kit ? also would it be better to run a stock air filter ?

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[Taz69]

sp, didnt see the clicky on your post, lol, are they available to buy from UK ?

Taz
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Honda Firestorm VTR 1000 in Yellow, Lubbly Jubbly

[bish777]

Gave taz a hand with his carbs, discovered the pilots were set way to lean and the float heights far too low(the floats touhed the body of the carbs!!!!)

Advised him to invest in a jet kit and pod filters after the usual GSXR oilcooled airbox struggle.....
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GSXR1100J

[sickpup]

[bish777]

Its not that bad, and the airbox on the oldskool GSXRs is a total bastard to work with-pods make life so much easier.

A good stage 3 kit will prevent it from being too peaky-leaving stock needles and richening the mains leaves the horrid flatspots.
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GSXR1100J

[Kickstart]

Hi

I have kept the stock airbox on the Bandit, but it is a bitch to work with. Cannot say I blame anyone going for pod filters (but I wanted to keep the bike looking standard).

The Bandit stock needles have virtually no taper. The GSXR stage 3 Dynojet kit needles have a large amount of taper, and also a large step about a third of the way up the useful bit of the needle.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[sickpup]

It takes a about 15 minutes to put the carbs on if you keep the airbox. Run the battery on a set of jump cables it makes life easier.

Just because you don't like the fuck around with the air-box is no reason to get rid of it.